I have been working on the heater install the last few weeks. I bought a (fairly expensive) heater from T7Design as the basis. I don't think it represented good value for money! When i took it to bits to modify slightly I found it just comprised a computer style fan, albeit a powerful one, and a heater matrix in a simple aly box. It would have been considerably cheaper to make it myself. Ho hum - you live and learn.
The heater has 4 outlets, I used 2 for the demister vents and the others for the footwells. I added a 5th, with a little flappy outlet thingy, that points directly into the interior. The heater is supposed to be 3.5kw (hmmm) so I hope it will keep things toasty.
I replaced the heater front panel with one of my one which also serves to mount it and carries the on off switch, the above mentioned 5th vent and will also act as a mount for a 12 volt socket and the choke cable.
At the moment the heater is just configured for re-circulation, but I have allowed enough space behind it to allow for some ducting to the outside world should it prove necessary. For the moment I considered this a complication too far.
I recently discovered the Car Builder Solutions catalog and this has provided the heater hoses with right angle bends. Very handy.
heater1 by
Robin Martin, on Flickr
heater2 by
Robin Martin, on Flickr
heater3 by
Robin Martin, on Flickr